linux-kernel - Re: [PATCH v2 0/3] dt-bindings: connector: usb: provide bindings for altmodes

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Date:   Thu, 16 Nov 2023 12:36:09 -0600
From:   Rob Herring <robh@...nel.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        Mark Gross <markgross@...nel.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        linux-usb@...r.kernel.org
Subject: Re: [PATCH v2 0/3] dt-bindings: connector: usb: provide bindings for
 altmodes

On Tue, Nov 14, 2023 at 12:13:26AM +0200, Dmitry Baryshkov wrote:
> In some cases we need a way to specify USB-C AltModes that can be
> supportd on the particular USB-C connector. For example, x86 INT33FE
> driver does this by populating fwnode properties internally. For the
> Qualcomm Robotics RB5 platform (and several similar devices which use
> Qualcomm PMIC TCPM) we have to put this information to the DT.
> 
> Provide the DT bindings for this kind of information and while we are at
> it, change svid property to be 16-bit unsigned integer instead of a
> simple u32.
> 
> NOTE: usage of u16 is not compatible with the recenty extended
> qcom/qrb5165-rb5.dts DT file. I'm looking for the guidance from DT and
> USB maintainers whether to retain u32 usage or it's better to switch to
> u16.

Depends if you are fine with the ABI break on this platform...

Rob